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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7b3aeadda770b9ddb0a13fe68f7756c6930c539e472dd601631a736863e70e' 
  AND token = 'Ohr+SyJaDMExsNqj0RoubhSrkFpzrz3mpsNuNcGKuc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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