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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77329b021e7a78b96be874630656088977ce8fa421be202bd7ffa7f6bee9e60' 
  AND token = 'dzXqcJGLiUfW1p2aJWa/U2Pz1416uVY5BXfgHDEvtig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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