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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fd29edae0944eb41638dee89e7c9349ff20bc9f632ee80d40b0ee24ff87756' 
  AND token = 'EORASx1i1DSXmibEFNzzPfLMmmfJMDE8YIrHLbp0k6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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