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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5866dede79a3249475b18d562c119455579947430c5ca0fe4d6fcd9cc39deb48' 
  AND token = 'WFpPiVnGxP2nn6kT6i28Whr+tEtgcb3RObyAIhmurqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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