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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbec68822ad26f0eaddd377fff34975e4f61e91c912c0a091edd0df6fffe8aa6' 
  AND token = 'eIPm3x+7Bfh9xWeAtDUeSOZy0yZ3Y5B6gwsATm6+IpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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