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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112afdb43caf37d026c8159f618a80c878794cf679128fb149b6b788c8db6eb2' 
  AND token = 'Cq+jnHCok0Ux+VL8bAbDyD8oEhkhdLfehsI1JHyGva8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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