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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca48539acaca3a749449b33d1e410ab9b1dcb3d52500b935959eacaf617932f' 
  AND token = '99BjlMELQ+L2eUQkJMo4Mj6odTuXVHIgpiv/Hl4fHyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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