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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7616afb2c2b00f9280786fb5d0891ef8fb89195becdf164f449ad3dd0e0c283e' 
  AND token = 'QfvwU2x7nevx14PSbf6sz8Vf3XZO0HuAIxItiktIQic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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