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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842a96c6d8dd70d409429cebeba75b4c653c0314f748a11adc84d064492922a0' 
  AND token = 'YGjp1UCyoaa+4lYnlgi1zlrV4fAV/aPF7Cajfc49TLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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