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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb80511928a147347388b112f9f366e316695f611baeb26b4e07d5d34045383' 
  AND token = 'bPH9pP6WQly/so4VMVHiHUVXXC5etq33jqEjJiVnz2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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