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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2da86ec2d892dd930038cbeec4bc48a98e9b5cf729d4ad87889cf48af0075f4' 
  AND token = 'pDF1J55IMwUH+OB4CT/RVCk6B4rXXMOg12oZADiMA5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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