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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c00e658ecf94e0c66cd9a76c1de8dba32f3a80836774355bcb13273f9b008a' 
  AND token = '4xyymVxSFucHv1q7wjJJiX0YR4ScoPEhKbscCog7FmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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