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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46d4a83b11bff5245273ed2e4969f0efdf569b8bb8bbbae776d0f004a6f1ce2' 
  AND token = 'gVJm5R7KbgA5cMA0iEm71gSoYusRZHfFfYk15pGrSzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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