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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb4e1e32292c16a33717e81ec0d3ebd9146e24ed27cdc0a7c3de63d620c76c1' 
  AND token = 'GvsyAHRJbIlIgG5Mniw64P89nF+uzxNsAfkCPwz8Hdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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