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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e9c705e5da6b3badd0a7d18cc4a883edb9a15fc8acef515bc16dab2ded18f8' 
  AND token = 'Dy/GPwdU7i81Zr0aDZVGayJqe9YWAezzUVvc2aShIFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}