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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153078cf95b0478bd160b9585718b97f9072809931351e2ac88d51d92357c2f3' 
  AND token = 'xPSvM8ndU/8nxadFOkuoOQg+t3x1ZVXm6SQ+FMY1yeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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