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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b87417c9803fba3f35f4001fbaffe969c72afdf72ffd66d1ce2bfce113406a9' 
  AND token = '7/Ssmr775wHSdV3I2P1D6U4hy+4Ov0NjwTqp/jd4GBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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