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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7980fbb321f46d09cf4cf69f04131ba89f9a61d4ecdd58b1e938881e3cdef17' 
  AND token = 'FFgZyXnldu6/O1F11/1lyFkwfV0WiyjWfPdi2D+lxqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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