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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37beac9a3f0a57f5b3bb80d62d53f9fe8141d75e0a4560103a93619de3dfc44' 
  AND token = '50vQ/n9m7Th4AiJwROG5QgItkoXPyY2cANnvTGa0dPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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