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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71961967589a99e1ffb5d00f45c86fcbfd837125e7e2a311b00a5776f5a408fd' 
  AND token = '1nhKA3qCQHIKoEOyBM63g4RhzhNAKJRQk69l3+hTCOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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