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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36e91fee96d04aa0dacd43b9a70e2a0e3f937a1e5509d5a25a2c90202d75a5c' 
  AND token = '9nBU0joB/c5GwvOkPiaSbvCqD0Si5WBPUpkB5cIlBXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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