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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d6cbc5a44d8deca97cf18379deb0b3c02366cbc9d6df9d3e1a19725d710536' 
  AND token = 'GOellFmpPS7/5epD6gH9Fn+Nyp1Fm5HxW1l5foundPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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