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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae0fca5ca288950425aad7ac2143b0c1500da67b256943fcbbf6c415d15eb9c' 
  AND token = 'l5RF0lpS8Br5Id78Em9/qWf6tpHEKDSNjCca+FJQ/g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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