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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ddacee55a1ecd2310f4ecf5aacd51191c7893d53c8e8aedc75c6ba9d361eb0' 
  AND token = '3FOMyu1BnShKPEyZ3+KTXBQUIA0hzCiKJte0h0+Hccs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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