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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f68c16e95c0b134757f1bb9cce6091750f32cd1b5e0ed4afa4261690d5bb2b1' 
  AND token = 'Q7f7hwe2CVgc1SAw2sSD3Z3Foao3YGPcX+WfyVpPmMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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