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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32500d7cd0f4da3feeec0df84654f56b9a39012d85cca2090dbd9ef64cc5583' 
  AND token = 'gMKmylB74LBK7rIAR6rJVxv3jkgkcLVLqyyIk6D3THo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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