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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80c6fe7dc8f2d6b80d3f8a5ad8d6b55cd9e6443037c1759a312d68fd49d963aa' 
  AND token = 'XfmFHKe9np3kViVAOu2NfgNQluYW6nMGBWTKdVoCgqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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