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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95448346f77af349862c67737f331dec3f98e53fbef19e7142cd772f0d91bc93' 
  AND token = 'y1e4aIivoPq5yNsOj3ru8txoQc2DSP7aeyTfm1sxmWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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