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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c96731fc11dfbb286b9377701913390acf2a5348d98adc7f2aedae25fbff02' 
  AND token = 'Szv/pIouya9N8F6Z8Qb/nw6DYSi6KYA1//jYAU8vqRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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