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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc0e1102edd2927ec7d9d277a91e1cc7399898235e2e712b79490b5dc3f753d' 
  AND token = 'XpqCq5IFRZRgQLc/ka9Cggme2tJIK/N+dEwQpcNBr20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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