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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517177a03a506b1c4b2bab3f888734c389f59a41803a64b56f01428f40cfa75d' 
  AND token = 'jugsFl1SuMzjbUm1/lRkn2pNivsKwR2ahRoRQ3JcnC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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