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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4eb58f91d56cbe7d8f8a6e59977c3ca9b5be65c732c2781c6ee958acc5613fd' 
  AND token = '2/IuajrImlsSlGZyDTFGolZL+rOQZkx2AXlXV1Br8k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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