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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb346b2fb67022b7bd3f630210bb5077e776358fcdab113a85e56d4c0250838' 
  AND token = 'HPRDe/GBjMABHS8Hf7BPBpLb4b6H19QwrBzZYC30YXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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