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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce348543929ae3a36d04211ea48dec4a4a64431a2657dafb45e28e270c55d00' 
  AND token = '+M9TMiGUmd7LiLwjnAfJaKS0O/Q0yEdtsGBLUPqvCv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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