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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014807de2739ab21d21b25f3ea60dc9bfea3015f2a4e7296886e0566f10e75d5' 
  AND token = 'MzzRRSDsP2yoBIHkClF46XGOuPCcV5h7q6MgBox+Y50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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