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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260da6cbcac253544aef006584173c10d9a98ae7e14ea1a244ee62a550a3fec9' 
  AND token = 'zGP78TL3q7pF7ghH/V1YG495qD5Jl3+OdvFrstiYk70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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