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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf668e2a2662371b9201aff8ae3077fb38b4b7e859084ab1be330cf65112a8e9' 
  AND token = 'OTUpGrGGlVeraqCA9ZlZSu1y6MKMMO4FGi18fPUzt0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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