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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9403b11987003a090389aee492002ff62a1824099c040f37e33418153cd3de3a' 
  AND token = '1LJ/pV9n+tQnW6q5kgDmIR/lsIGpg82DY1PkOVOHpr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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