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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c3271216525be516bc314961a574a5de4b4a48c47ad7f6cc70c3410bb0f18a' 
  AND token = '9Bs0lMXtouno/03hBFBrxQDGGM56gdTgO03E3WbbX9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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