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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6626f7f0001ff883d81a4901f065d3148c6806f8cf550d10cd5e853efdee17' 
  AND token = 'MYanjnfFKlKu88K5Ftn8OEMPiGQjkypZE6UXqMX4lPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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