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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4057dcd50e60c30edad32ab1b2da773589f84bb19d30e3f50623b165a39383' 
  AND token = '/l46v72Glm7MweFyA6jtOg18GHvDxPfYOOqTxSAxGPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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