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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecd69f0223f34543b050e2d2ce58857fffdeb051753052230d938de6a86a8ca' 
  AND token = 'NvIdFZ22G9dwBuJXP/JMQ+JA92cRsoof49ie8oaEAiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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