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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62fbb8eb5e3f2a2c96a39db29cf4b07927ba3b99067a30c314f1e44775cace3e' 
  AND token = 'lv2pjQU5ckCye19EfvnvaV+su+OR4bp+BJhSNbGzfX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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