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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c61cf63ea95c8ba61453b7532f443c22e26f3eff954a88881733bf991d903f7' 
  AND token = 'UDEO3NBb+zWQ/cwf2UbccH2y+iOUSCa9f0STddiq9CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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