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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29da0882e2b747b717d2792d17b7ca972cc78e41225947b319babe2ff5f4b6e7' 
  AND token = '9GHoPjIVnh4eGPAVD+qmt8laFYZWNiYiA5o6U4QPZLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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