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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7930d6ebcffb990cd2a26b1d5a6e4162d5fb6d1e18bd4df2b228f2d5abcb737' 
  AND token = 'nH/AF/RYIZRHdaXSr3H9Td6tkOnL5gMxvpNoWW3FHag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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