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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93644f9c66b68cc47ea37f1de0585adec93483d0f12dc1851c539c6e20e54667' 
  AND token = 'Ou+al3CQE2n9tkdUgVhsvKmBkN0i2vz7PoMD1BSgtnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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